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Position Estimation for Hybrid Excited Switched Flux PM Machine by Injecting High-Frequency Pulse into the Field Winding |
Liu Xu1,2, Niu Daqiang1,2, Cao Yang1,2, Zhou Qi1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Electrical Engineering Hebei University of Technology Tianjin 300130 China; 2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province School of Electrical Engineering Hebei University of Technology Tianjin 300130 China |
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Abstract Due to the low saliency ratio in the hybrid excited switched flux permanent magnet (HESFPM) machines, the conventional position estimation methods, which use high-frequency signal injection into the armature windings for the permanent magnet synchronous machines at zero or low speed, may not have appropriate estimated accuracy for the sensorless control of the HESFPM machine. Therefore, in the paper, the method of injecting high-frequency (HF) pulse signals into the field winding is developed. In the HESFPM machines, since the flux-linkage produced by the field excitation is always aligned with the d-axis, the injected HF pulse signal in the field winding can only induce the HF current signal in the actual d-axis. Based on this principle, the estimated rotor position can be obtained once the HF current signal in the estimated q-axis equals zero. To verify the proposed position estimation method, an experiment on a HESFPM prototype was carried out. The results show that the proposed position estimation method for the HESFPM machines exhibits high accuracy in both steady-state and dynamic response.
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Received: 09 June 2020
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